Heat resisting damper assembly



Aug. 16, 1932 F. A. FAHRENWALD HEAT RESISTING DAMPER ASSEMBLY Filed March 23, 1929 5 lllglllllllll Patented Aug. 16, 1932 FRAVNX`AL`F-KARENWALD5KOF CHICAGO, ILLINOIS4 l' t HEAT nnslsrrne'nmran AssnMBLr Y" l, Q'Apiication ni@ March 23, 1929 serialY N. Maese..

This invention relates to improvements in a damper assembly and particularly to a damper assembly that is "highly resistant toheat and isV adapted to slide `easily and sub'- stantially seal the flue passage when in closed position".

Ing-the n especially where `the damper is utilized in a kiue carryingY gases `of high temperature,fthe guiding",connectionsmust befsuiiiciently loose toy allow for expansion and contraction of the plate to avoid'binding Aand compression strains. It isthereforediliicultfy becauseJo the loose vconnections to 'obtain atight seal Vwhen the damper Aisin closed position. It hasfurther been vfound thatfone .piece plates used as dampers are impracticable since they are prone to excessive 'warping orcracking due' to uneven [temperature i conditions 'encountered. j l kf It is therefore the purpose of thisrinvention Vto provide in a vdamper f assembly, a construction which permits free.inovement of Vthe damper'at all times land alloivsia substantially'tight seal when the damperfisfin the closed position. j f

',It is further a'V purpose of. my invention to obtain otheradvantages togetlierfwith a construction of damper which is notfsusceptible to warping orA cracking by the utilization yof a damper composedooffa l'plurality of separate plates constructed according to the improvements shown in my 'prior Patent 1,629,689, issued. May; 24,1927, and further 35 `designedsoas to be particularly adaptable to the presentimprovements. 'Y y 's lIt ,'s *aV particular` feature of my linvention that thefdamperassembly so arranged that the damper. will Vslide in inclined direction thereby,` allowing'A the -gravital orce due -.to Vthe .weight-'lof the damper, to so act astio `cause its underside to sealagainstthe guiding Iconnections.;y n' A; Urthe-@featureoffmyinvention resides `in a construction inI whichtheoutside edges ordinary 'form Y. of damper" plates,

of thedamper assembly have been sufficiently widened so as to lie above the'plane of the remainder of'the damper construction whereyby a continuous sealing edgeis formed which is pressed into engagement with the guiding 'surfaces due to the' weightof the. damper.

For' afurther and 'fuller understanding of the particular objects andad'vantages of my invention reference 'may be made tothe-'detail description in connection with the/at` 'tacheddr'awing which illustrates'a preferred embodiment infwhich-'g- "f 'f igure -1 is a cross sectional'elevationA of 'a flue with the; damper v,assembly in closedl position. l

' ligure 2 is avertical sectional elevation on line 2 '2 of Figure Land` w v F 'gure 3 isa' detail plan view ofthe damper assembly.

- 1 is .widened atits bottom edge Aby a' raisedportionAl on both sides for a purpose-later ,to be described.:YY The upper. edge of the lower The construction of the damper assembly* plate l is provided with spacedrjprojections y [5` whichoverlap the marginal edger of the -nextadjacent intermediate plate 2. The in- Atermekliate .plate 2 visprovidedat. itsilower fedge withsimilar downwardly extending proiectonsf which' extend btweeathlef Projec- `"tions 5'.: 'The remaining connections'between t 'thel platesare made ina similarmanner by upwardly `extending projections 5 and downwardlyk extending projections 6: A'Illie gpro- "Vjec'tions are adaptedto' bearranged 'on the samer, side' of the; damper. assembly, preferably on the `cooler` side, since theexcessive heat of the'other side mayl tendjtoY burnlo PTOQCOIIS5f The projections 5 and 6`.coop

eratevj to prevent warping '01EV -Atheplates due- .toi unequal temperature coinditioiia'v The side edgesof the plates are pref l tally seat in bearin engagement with each other and with an e ge of each of said guide bars, the bottom damper plate having its bottom edge formed to fit in and grevitally seat against an edge of the bottom groove of said damper guide frame, the top damper plate having its upper edge formed to closely lit the top opening in said damper guide frame and adapted to gravitally seat against the side Wall of said openin and means connected to said top plate or moving said damper assembl Signed at Chlcago, Illinois, this 12th day of March, 1929.

FRANK A. FAHRENWALD. 

